As you can tell I'm a Kane fan lol!
I hope we go another decade with Kane, But it seems that another year/two tops in three years it is time for the Big Red Machine to retire.
I would like to see one last time a badass run like in the old days.
They can make Paul Bearer return and make some ritual with Kane returning him to a crazy monster again, and explaining to us that Kane true powers awakes when he's bad (=heel)

I know WWE doesn't care about those supernatural gimmicks anymore (which is a shame really, atleast in my opinion), but that would be totally cool if it could happens, so just for the fun of it, write your Idea how Kane can make one last Monster run...

Give him his old mask/attire back, make him go nuts again and decimate the roster for REAL this time, make his as psychotic as PG can allow, then Bryan should be the one to stop him. (and go back in the main event afterwards)

Daniel Bryan gets pinned and Team Hell No lose the titles... Kane holds out his hand and helps Bryan get up but then Chokeslams & Tombstones him. That's how Team Hell No should end. After that, Kane could go to SmackDown and chase the WHC.

I like the BOD vs Shield idea- maybe it could be something for Mania seeing as Taker probably isn't retiring this year. I'd like to see Kane and Taker team up at Mania before they both retire. The Shield are good opponents for them.